Piston



UNITEDSTATES PATENT OFFICE.

' JAMESJRANKLIN mums, on sHAwNEE, OKLAHOMA.

rlsroN.

Applmation mea .ranuary 41926. serial No. 79,194.

This invention relatesto improvements. in pistons, the general object of the invention being to provide means whereby the Wrlst pin is so attached to thepiston that the piston can rotate inthecylinder and the ends of the pin are covered by the piston which will other features of construction and inthe' 'combination and arrangement ofthe several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the 4appended claim.

In describing my invention in detail, reference. will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout theseveral views, and in which 1,-

Figure 1 is a sectional view through the improved piston.

`Figure 2 is a similar View but taken at right angles to Figure 1.- 3G Figure 3 is a' view ofthe spring washer.

Figure 4 is a vieW of one of the bushing rings. 4

Figure 5 is a view of the other bushing I these views, 1 indicates the piston which is formed with an interior flange 2 above its center and an internal screw threaded part 3 below its center. The under face of the flange 2 forms a seat for a bush- '40 ing ring 4t which is provided l'Withfoppositely arranged semi-circular recesses 5, which, with the similar recesses in the bushing ring 6, form bearings for the Wrist pin which connects the piston "with the connecting rod 8. A spring Washer 9, preferably formed of corrugated metal, isplaced against the ring 6 and then a nut member l() is threaded through the portion 3 to holdthe parts assembled.' p This member engages the Washer and is in turn engaged by a lock washer 1l which is held in position by a lock nut 12.

The nuts are provided With the holes 13 4to that they can be turned by a suitable tool. v

From the foregoing, it will be seen that the Wristpin is supportedin the piston by the rings Ltand 6 and tlatthese rings are 'so supported in the piston that they can rotate in the space formed by the flange 2 and the 'nut 10. Thus when the parts are assembled'in a motor, the piston can rotate :n the cylinder so as to-reduce Wear oi'- the yparts .and in view of the fact that the ends ofthe pin do not extend through the piston,Y there is no danger of the pin contacting with the Walls of the cylinder as is the case with' motors as now constructed.

' While I prefer to use the spring washer 9, this washer can be omitted, if desired.

It is thought from the foregoing description that'the advantages and novel features of my invention will be readily apparent.

I desire it ,to be understood that I may,

make changes in the construction and in the lcombination and arrangement of the several parts, provided that such changes fall with 'in the scope of the appended claim.

What I claim is z-f A piston having an internal ange abov'e .its center and an internal screw threaded part below its center, a bushing ring in the piston engaging the under face of the flange, asecon'd bushing ring in the piston, said rings having recessesl forming bearings, a Wrist pin engaging the bearings, a nut engaging the threaded part of the piston for rotatably holding the bushing rings in place and a ycorrugated spring Washer arranged between the nut and the lowerbushlng ring In testimony whereof I- atlix my signature.

JAMES FRANKLIN MAYiis. 

